find the percentage of installation

[lovlin]

Hi friends,
i just wanted to know how the percentage calculation for the package installation or any software installation is incorporated.. especially while installing rpm's it will show a like like
loading... ####################......
is there a ready code or script to implement this ? or can anyone tell me how do i implement this .. say i am installing a debian package.. then i want the screen to like like above... loading.. ################....
please give your suggestions..
thanks...

[lovlin]

Hi friends i just got a code
from the following link....
Theiling Online: ASCII bar
...this code is regarding the progress bar..
can anyone tell me how to use this function to display progress bar ?(i am not able to understand this script since i know very little about that.. )

BAR_VERSION=1.4
bar_cat()
{
test -z "${BAR_WIDTH}" && test -n "${COLUMNS}" && BAR_WIDTH=${COLUMNS}
( expr "${BAR_WIDTH}" + 0 >/dev/null 2>&1 ) || BAR_WIDTH=0
BAR_WIDTH=`expr ${BAR_WIDTH} + 0` || BAR_WIDTH=0
test "x${BAR_WIDTH}" = x0 && BAR_WIDTH=76
test -n "${BAR_BS}" || BAR_BS=1048567
test -n "${BAR_PERC}" || BAR_PERC=1
test -n "${BAR_ETA}" || BAR_ETA=1
test -n "${BAR_TRACE_WIDTH}" || BAR_TRACE_WIDTH=10
test -n "${BAR_CMD}" || BAR_CMD=cat
test -n "${BAR_L}"  || BAR_L='['
test -n "${BAR_R}"  || BAR_R=']'
test -n "${BAR_C0}" || BAR_C0='.'
test -n "${BAR_C1}" || BAR_C1='='
test -n "${BAR_OK}" || BAR_OK=1
BAR_WIDTH=`expr ${BAR_WIDTH} - 3`
bar_trace=''
if test "x${BAR_TRACE}" = x1
then
BAR_WIDTH=`expr ${BAR_WIDTH} - ${BAR_TRACE_WIDTH}`
bar_lauf=${BAR_TRACE_WIDTH}
bar_t_space=''
bar_t_dot=''
while test "${bar_lauf}" -gt 1
do
bar_t_space="${bar_t_space} "
bar_t_dot="${bar_t_dot}."
bar_lauf=`expr ${bar_lauf} - 1`
done
bar_trace="${bar_t_space} "
fi
bar_eta=''
BAR_GET_TIME='echo'
( expr 1 + ${SECONDS} >/dev/null 2>&1 ) || BAR_ETA=0
if test "x${BAR_ETA}" = x1
then
BAR_GET_TIME='( echo ${SECONDS} )'
BAR_WIDTH=`expr ${BAR_WIDTH} - 6`
bar_eta='--:-- '
fi
bar_perc=''
if test "x${BAR_PERC}" = x1
then
BAR_WIDTH=`expr ${BAR_WIDTH} - 5`
bar_perc='  0% '
fi
BAR_GET_SIZE='( ls -l "${BAR_DIR}${bar_file}${BAR_EXT}" | sed "s@  *@ @g" | cut -d " " -f 5 ) 2>/dev/null'
( ( echo a                   ) >/dev/null 2>&1 ) || BAR_OK=0
( ( echo a | dd bs=2 count=2 ) >/dev/null 2>&1 ) || BAR_OK=0
( ( echo a | grep a          ) >/dev/null 2>&1 ) || BAR_OK=0
( ( echo a | sed 's@  *@ @g' ) >/dev/null 2>&1 ) || BAR_OK=0
( ( echo a | cut -d ' ' -f 1 ) >/dev/null 2>&1 ) || BAR_OK=0
test "${BAR_WIDTH}" -ge 4 || BAR_OK=0
BAR_ECHO='echo'
BAR_E_C1=''
BAR_E_C2=''
BAR_E_NL='echo'
if echo -n abc >/dev/null 2>&1
then
BAR_E_C1='-n'
fi
if ( ( ${BAR_ECHO} "${BAR_E_C1}" abc ; echo 1,2,3 ) | grep n ) >/dev/null 2>&1
then
if ( ( ${BAR_ECHO} 'xyz\c' ; echo 1,2,3 ) | grep c ) >/dev/null 2>&1
then
if ( ( printf 'ab%s' c ; echo 1,2,3 ) | grep abc ) >/dev/null 2>&1
then
BAR_ECHO='printf'
BAR_E_C1='%s'
else
BAR_ECHO=':'
BAR_E_C1=''
BAR_E_NL=':'
BAR_OK=0
fi
else
BAR_E_C1=''
BAR_E_C2='\c'
fi
fi
bar_shown=0
if test "${BAR_OK}" = 1
then
bar_lauf=0
bar_graph=''
while test `expr ${bar_lauf} + 5` -le "${BAR_WIDTH}"
do
bar_graph="${bar_graph}${BAR_C0}${BAR_C0}${BAR_C0}${BAR_C0}${BAR_C0}"
bar_lauf=`expr ${bar_lauf} + 5`
done
while test "${bar_lauf}" -lt "${BAR_WIDTH}"
do
bar_graph="${bar_graph}${BAR_C0}"
bar_lauf=`expr ${bar_lauf} + 1`
done
${BAR_ECHO} "${BAR_E_C1}" "
${bar_trace}${bar_eta}${bar_perc}${BAR_L}${bar_graph}${BAR_R}
${BAR_E_C2}" 1>&2
bar_shown=1
fi
( ( test 1999999998 = `expr 999999999 + 999999999` ) >/dev/null 2>&1 ) || BAR_OK=0
bar_large_num="........."
bar_div=""
bar_numsuff=""
bar_size=0
if test -n "${BAR_SIZE}"
then
bar_size=${BAR_SIZE}
while expr "${bar_size}" : "${bar_large_num}" >/dev/null 2>&1
do
bar_div="${bar_div}."
bar_numsuff="${bar_numsuff}0"
bar_size=`expr "${bar_size}" : '\(.*\).$'`
done
BAR_GET_SIZE="echo '${BAR_SIZE}'"
else
for bar_file
do
bar_size1=0
if test -f "${BAR_DIR}${bar_file}${BAR_EXT}"
then
bar_size1=`eval "${BAR_GET_SIZE}"`
if test -n "${bar_div}"
then
bar_size1=`expr "${bar_size1}" : '\(.*\)'${bar_div}'$'` || bar_size1=0
fi
while expr "${bar_size1}" : "${bar_large_num}" >/dev/null 2>&1
do
bar_div="${bar_div}."
bar_numsuff="${bar_numsuff}0"
bar_size1=`expr "${bar_size1}" : '\(.*\).$'`
bar_size=`expr "${bar_size}" : '\(.*\).$'` || bar_size=0
done
if test -n "${bar_div}"
then
bar_size1=`expr "${bar_size1}" + 1`
fi
bar_size=`expr ${bar_size} + ${bar_size1}`
while expr "${bar_size}" : "${bar_large_num}" >/dev/null 2>&1
do
bar_div="${bar_div}."
bar_numsuff="${bar_numsuff}0"
bar_size=`expr "${bar_size}" : '\(.*\).$'`
done
else
BAR_OK=0
fi
done
fi
bar_quad=`expr ${BAR_WIDTH} '*' ${BAR_WIDTH}`
test "${bar_size}" -gt "${bar_quad}" || BAR_OK=0
if test "${BAR_OK}" = 0
then
for bar_file
do
if test "${bar_file}" = "/dev/stdin"
then
eval "${BAR_CMD}"
else
eval "${BAR_CMD}" < "${BAR_DIR}${bar_file}${BAR_EXT}"
fi
done
else
bar_want_bps=`expr ${bar_size} + ${BAR_WIDTH}`
bar_want_bps=`expr ${bar_want_bps} - 1`
bar_want_bps=`expr ${bar_want_bps} / ${BAR_WIDTH}`
bar_count=1
if test "${bar_want_bps}" -gt "${BAR_BS}"
then
bar_count=`expr ${bar_want_bps} + ${BAR_BS}`
bar_count=`expr ${bar_count} - 1`
bar_count=`expr ${bar_count} / ${BAR_BS}`
fi
bar_wc=`expr ${BAR_WIDTH} '*' ${bar_count}`
bar_bs=`expr ${bar_size} + ${bar_wc}`
bar_bs=`expr ${bar_bs} - 1`
bar_bs=`expr ${bar_bs} / ${bar_wc}`
bar_bps=`expr ${bar_bs} '*' ${bar_count}`
bar_bph=`expr ${bar_size} + 99`
bar_bph=`expr ${bar_bph} / 100`
bar_pos=0
bar_graph="${BAR_L}"
bar_cur_char=0
bar_t0=`eval "${BAR_GET_TIME}" 2>/dev/null` || bar_t0=0
for bar_file
do
if test "x${BAR_TRACE}" = x1
then
bar_trace=`expr "${bar_file}" : '.*/\([^/][^/]*\)$'` || bar_trace="${bar_file}"
bar_trace=`expr "${bar_trace}${bar_t_space}" : '\('${bar_t_dot}'\)'`
bar_trace="${bar_trace} "
fi
bar_char=`expr ${bar_pos} / ${bar_want_bps}` || bar_char=0
while test "${bar_char}" -gt `expr ${bar_cur_char} + 4`
do
bar_graph="${bar_graph}${BAR_C1}${BAR_C1}${BAR_C1}${BAR_C1}${BAR_C1}"
bar_cur_char=`expr ${bar_cur_char} + 5`
done
while test "${bar_char}" -gt "${bar_cur_char}"
do
bar_graph="${bar_graph}${BAR_C1}"
bar_cur_char=`expr ${bar_cur_char} + 1`
done
bar_size1=`eval "${BAR_GET_SIZE}" 2>/dev/null` || bar_size1=0
if test -n "${bar_div}"
then
bar_size1=`expr "${bar_size1}" : '\(.*\)'${bar_div}'$'` || bar_size1=0
bar_size1=`expr "${bar_size1}" + 1`
fi
bar_total=0
(
exec 6>&1
exec 5<"${BAR_DIR}${bar_file}${BAR_EXT}"
while test "${bar_total}" -lt "${bar_size1}"
do
dd bs="${bar_bs}" count="${bar_count}${bar_numsuff}" <&5 >&6 2>/dev/null
bar_total=`expr ${bar_total} + ${bar_bps}`
if test "${bar_total}" -gt "${bar_size1}"
then
bar_total="${bar_size1}"
fi
bar_pos1=`expr ${bar_pos} + ${bar_total}`
bar_proz=`expr ${bar_pos1} / ${bar_bph}` || bar_proz=0
if test "x${BAR_PERC}" = x1
then
bar_perc="  ${bar_proz}% "
bar_perc=`expr "${bar_perc}" : '.*\(.....\)$'`
fi
if test "x${BAR_ETA}" = x1
then
bar_diff=`eval "${BAR_GET_TIME}" 2>/dev/null` || bar_diff=0
bar_diff=`expr ${bar_diff} - ${bar_t0} 2>/dev/null` || bar_diff=0
bar_100p=`expr 100 - ${bar_proz}` || bar_100p=0
bar_diff=`expr ${bar_diff} '*' ${bar_100p}` || bar_diff=0
bar_diff=`expr ${bar_diff} + ${bar_proz}` || bar_diff=0
bar_diff=`expr ${bar_diff} - 1` || bar_diff=0
bar_diff=`expr ${bar_diff} / ${bar_proz} 2>/dev/null` || bar_diff=0
if test "${bar_diff}" -gt 0
then
bar_t_unit=":"
if test "${bar_diff}" -gt 2700
then
bar_t_uni="h"
bar_diff=`expr ${bar_diff} / 60`
fi
bar_diff_h=`expr ${bar_diff} / 60` || bar_diff_h=0
if test "${bar_diff_h}" -gt 99
then
bar_eta="     ${bar_diff_h}${bar_t_unit} "
else
bar_diff_hi=`expr ${bar_diff_h} '*' 60` || bar_diff_hi=0
bar_diff=`expr ${bar_diff} - ${bar_diff_hi}` || bar_diff=0
bar_diff=`expr "00${bar_diff}" : '.*\(..\)$'`
bar_eta="     ${bar_diff_h}${bar_t_unit}${bar_diff} "
fi
bar_eta=`expr "${bar_eta}" : '.*\(......\)$'`
fi
fi
bar_char=`expr ${bar_pos1} / ${bar_want_bps}` || bar_char=0
while test "${bar_char}" -gt "${bar_cur_char}"
do
bar_graph="${bar_graph}${BAR_C1}"
${BAR_ECHO} "${BAR_E_C1}" "
${bar_trace}${bar_eta}${bar_perc}${bar_graph}${BAR_E_C2}" 1>&2
bar_cur_char=`expr ${bar_cur_char} + 1`
done
done
) | eval "${BAR_CMD}"
bar_pos=`expr ${bar_pos} + ${bar_size1}`
done
fi
if test "${bar_shown}" = 1
then
test "x${BAR_TRACE}" = x1 && bar_trace="${bar_t_space} "
test "x${BAR_ETA}" = x1   && bar_eta='      '
if test "x${BAR_CLEAR}" = x1
then
test "x${BAR_PERC}" = x1 && bar_perc='     '
bar_lauf=0
bar_graph=''
while test `expr ${bar_lauf} + 5` -le "${BAR_WIDTH}"
do
bar_graph="${bar_graph}     "
bar_lauf=`expr ${bar_lauf} + 5`
done
while test "${bar_lauf}" -lt "${BAR_WIDTH}"
do
bar_graph="${bar_graph} "
bar_lauf=`expr ${bar_lauf} + 1`
done
${BAR_ECHO} "${BAR_E_C1}" "
${bar_trace}${bar_eta}${bar_perc} ${bar_graph} 
${BAR_E_C2}" 1>&2
else
test "x${BAR_PERC}" = x1 && bar_perc='100% '
bar_lauf=0
bar_graph=''
while test `expr ${bar_lauf} + 5` -le "${BAR_WIDTH}"
do
bar_graph="${bar_graph}${BAR_C1}${BAR_C1}${BAR_C1}${BAR_C1}${BAR_C1}"
bar_lauf=`expr ${bar_lauf} + 5`
done
while test "${bar_lauf}" -lt "${BAR_WIDTH}"
do
bar_graph="${bar_graph}${BAR_C1}"
bar_lauf=`expr ${bar_lauf} + 1`
done
${BAR_ECHO} "${BAR_E_C1}" "
${bar_trace}${bar_eta}${bar_perc}${BAR_L}${bar_graph}${BAR_R}${BAR_E_C2}" 1>&2
${BAR_E_NL} 1>&2
fi
fi
}

thanks..